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    <script>
        /*         3.1 求数组的最小值   (必做)
                 [5,8,12,9,10,3,56] */
        let arr = [5, 8, 12, 9, 10, 3, 56];
        let min = arr[0];
        for (let i = 1; i < arr.length; i++) {
            if (arr[i] < min) {
                min = arr[i];
            }
        }
        console.log(min);
    </script>
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